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import ast
from unittest import TestCase
from pyecsca.ec.context import (local, DefaultContext, OpResult, NullContext, getcontext,
setcontext,
resetcontext)
from pyecsca.ec.coordinates import AffineCoordinateModel
from pyecsca.ec.curves import get_curve
from pyecsca.ec.mod import Mod
from pyecsca.ec.mult import LTRMultiplier
from pyecsca.ec.point import Point
class OpResultTests(TestCase):
def test_str(self):
for op, char in zip((ast.Add(), ast.Sub(), ast.Mult(), ast.Div()), "+-*/"):
res = OpResult("X1", Mod(0, 5), op, Mod(2, 5), Mod(3, 5))
self.assertEqual(str(res), "X1")
class ContextTests(TestCase):
def setUp(self):
self.secp128r1 = get_curve("secp128r1", "projective")
self.base = self.secp128r1.generator
self.coords = self.secp128r1.curve.coordinate_model
self.mult = LTRMultiplier(self.secp128r1, self.coords.formulas["add-1998-cmo"],
self.coords.formulas["dbl-1998-cmo"], self.coords.formulas["z"])
def test_null(self):
with local() as ctx:
self.mult.multiply(59, self.base)
self.assertIsInstance(ctx, NullContext)
def test_default(self):
token = setcontext(DefaultContext())
self.addCleanup(resetcontext, token)
with local(DefaultContext()) as ctx:
self.mult.multiply(59, self.base)
self.assertEqual(len(ctx.actions), 10)
self.assertEqual(len(getcontext().actions), 0)
def test_execute(self):
with self.assertRaises(ValueError):
getcontext().execute(self.coords.formulas["z"], self.base, self.base)
with self.assertRaises(ValueError):
getcontext().execute(self.coords.formulas["z"],
Point(AffineCoordinateModel(self.secp128r1.curve.model),
x=Mod(1, 5), y=Mod(2, 5)))
def test_str(self):
with local(DefaultContext()) as default:
self.mult.multiply(59, self.base)
str(default)
str(default.actions)
with local(NullContext()) as null:
self.mult.multiply(59, self.base)
str(null)
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